Device for grinding artificial-stone plates.



F. FLORSTBDT.

DEVICE FOR GRINDING ARTIFICIAL STONE PLATES. APPLIOATION FILED Nov.15,1909.

1,035,562. Patented Aug". 13,1912.

2 SHEETS-31131 1.

Ff FLORSTEDT. DEVICE FOR GRINDING ARTIFICIAL STONE PLATES.

APPLICATION I'ILED H0115 I909.

Patented Aug. 13, 1912.

2 SHEET8-SHEET 2.

Witnesses UNITED @FIEICE FRIEDRICH FLORSTEDT, OF BERLIN, GERMANY,AS$IGNOR TO THE FIRM OF SCHLEIF- MASCHINEN VERWERTUNGS GESELLSCHAFT M.B. ii, 01? BERLIN-WILMERSDORF,

GERMANY.

Srceifieaticn of Letters Patent.

Patented Aug. 13,1912.

Application filed November 15, 1909. Serial No. 528,051.

To all whom it may concern Be it known that I, Fnnanncn l Lons'rnn'r, asubject of the German Emperor, and resident of llerlin, Germany, haveinvented certain new and useful improvements in Devices forGrindingiu'titiciah tone llat-es, of which the following is aspecification.

This invention relates to a device primarily designed for grindingart-iticial stone plates.

Appa 'atuses for the grinding 0t artificial stones have been hereto toredevised, but this invention is tor a new device tor grinding artificialstones upon each other.

lintil now and even up to the latest times, large steel grinding diskshave been employed, which rotating at about (it) turns a, minute causedthe objects to be ground and which were held in a suitable manner, torotate in an irregular manner. This method has two dravi'hacks: In thefirst place the steel grinding disks wear and require to he turned againon the lathe and in the second place the waste or dust produced by thecentrit'ngal action of the relatively hard steely grinding disks, is sogreat. that it becomes in 'uri0us to the person operating the grindingmachine.

Now, the present invention relates to a device for grinding plates madeot natural or artificial stone (artificial granite, terrazzo) as well asof other grindablc materials by rubbing upon each other two of saidplates to be worked so that both are ground. at the same time, workpiece and tool. The upper plate receives to this etl'ect advantageouslya reciprocating motion. The lower plate can besides be arranged in areceptacle intended to receive the grinding means (sand and water). andbe rotated at the same time as said receptacle.

The accompauyin; d 'awings given by way of example show one form otembodiment oi the invention and in these drawings: Figure l is a sideview ot' the rinding machine. Fig. 2 is the top plan view oil the sameand Fig. 3 shows again a side eleva tion of the machine but at 90" withret'eronce to the view shown by Fig. 1.

In the drawings the main parts or members of the machine are designatedin their order by the letters of the alphabet used as reference letters.v

The machine comprises a shaft 1) driven by the pulley asaid shaft is abevel toothed wheel c and crank (it The first r0- tates, through themedium of a second bevel wheel a vertically arranged shaft 7' on whichis keyed the working tub g. Secured to the bottom ol' said tuh areabutments lb l'orrnod of angle irons and intended to receive frames 1'which have the shape of the stone plate A: which they are intended toreceive. The stone plate forms one of the work pieces.

The crank )rovided on shaft 1) causes, through the medium of aconnecting rod 1, a lever II! to oscillate, which lever 711 has itsfulcrum at n. The free end 0 ol the lover or is hingedly connected withthe horizontally guided reciprocating rod s to which a t'ramc intendedto receive the stone plate 2', is secured at the point 1). This stoneplate 7' forms the second work piece. The reciprorati11g rod s isextended beyond 7) and its extension is guided by means of two tlatirons so as to avoid lateral deviations.

lv'hcn the shaft, I is rotated, the bevel wheel causes the tub g and,with it, the first stone plate h, to rotate while at the same time-thosecond stone plate 1- receives a rectilinear recitnrocatiing; motionthrough the medium of the crank. (l, the connecting rod Z, the lever mand the reciprocating rod s. The mass contained in the tub and formed ofgrinding sand and water is raised by a stationary batllo plate or shovelo and is projected on or between the stone plates so that the desiredgrindingaction is obtained. in order to increase the pressure of thestone plate r on the stone plate Z: a weight n has been provided whichis carried in an adjustable manner by the reciprotaiting rod s on whichit; can be secured by means of screws.

\Vith my apparatus waste of the grinding sand is considerably reduced asthe same sand can be used about six times and when it has been reducedtoo line it can be used in making mortar.

The batllc plate or shovel 4) has for its object to cause the grindingmeans to accun'uilate .in front. of it and to be thrown between thesurface of the two stones to be ground. The battle-plate or shovel r isprovided with an upstanding arm '11 which is slidably" mounted in aclamp o and secured by a screw 0 to permit the vertical adjustment ofthe shovel. it may be added that the base frame work of the machinewhich in the drawing has been shown as being com-.

posed of angle iron and sheet metal, can also be made of cast iron.

It is needless to say that the above described device is mainly employedfor artificial stone plates, but that there is nothing which wouldprevent its application to natural stone plates.

I claim:

1. A device of the character described, comprising a rotary receptacleprovided with a holding member upstanding from the inner surface of itsbottom, a lower grinding member received by said holding mem be r, ahorizontally reciprocating frame arranged above and out of contact withsaid holding member, and an upper grinding member received by saidreciprocating frame, and means for actuating said rotary receptacle andsaid grinding members including intergeared beveled wheels, the shaft ofone wheel carrying said rotary receptacle, a shaft of the other wheelbeing provided with a crank, a centrally pivoted lever, alink-connection between said crank and said lever, a reciprocating rodalso con-' nected to said lever and pivoted to said 11pper grindingmember holding frame, and a guide receiving between its members saidreciprocating rod," the last named being weighted intermediate of saidlever and the point of connection therebetween'and said holding frame.

2. In a machine for grinding artificial stone plates the combinationwith the framework of a tub adapted to receive the grinding material andone of the two stone plates to be ground, means for rotating the saidtub and first stone plate, means for applying the second stone plate onthe first one and for reciprocatin' it, a stationary shovel projectingin said tu and adapted to gather the said grinding mate-rial and toproject it on the surface to be ground, and means for adjusting the saidshovel vertically, substantially as and for the purpose set forth.

3. In a machine for grinding stones, a rotatable tub adapted to receivea grinding medium, means for rotating said tub, means for supporting astone in: said tub, the said stone adapted to rotate with said tub, areciprocating carriage adapted to maintain a second stone above and inpontact with said first mentioned stone, and an. adjustable bafiie platecomprising a curved blade adapted to deliver the said grinding me 'diumonto the surface of the rotating grind ing stone.

y In testimony whereof I have hereunto set my hand in presence of twowitnesses.

' FRIEDRICH FLORSTEDT.

Witnesses WOLDEMAR H UPT, HENRY HAsPER.

